Malicious PDF — malware analysis report

Static analysis result for SHA-256 31ea9aee1c639bf3…

MALICIOUS

PDF

91.7 KB Created: 2021-07-08 11:51:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cf7aca3b79feb32b90c5c26bbc8f2ef4 SHA-1: eb5c04b18ac8798befe7ebe01ca4a734f37a902b SHA-256: 31ea9aee1c639bf3033c95dc4154537a34c25d02513052c1f8ab2d3fa9419a99
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to numerous compromised WordPress upload directories and other disposable hosting sites, suggesting an attempt to distribute malicious content or phish for credentials. The presence of multiple external URIs and the 'link farm' heuristic strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://samudra99.com/contents//files/gisegaremupe.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16072d083aee13---55220785565.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c49216917ab---65040213263.pdf
    • http://sola-brothers.com/userfiles/file/ziragofumijogonaxem.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807952e30dc---kuxevorifevulojefenovina.pdf
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/b3af5462fea22110d110c3984d7a8ad1/60526002683.pdf
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/892b01475dbe71da2ebfcf31cf02c011/86621485793.pdf
    • http://alfavs.eu/userfiles/file/69652399784.pdf
    • http://traiteur-ribot.fr/userfiles/file/dibajogapurepelaw.pdf
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/kqntuinf6vldvlans567smkuu4/20548873789.pdf
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/246e27713d1fc0ed606d1d4687e680c8/gojuze.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/jobebesomusubizuwugif.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609415133f1ef---50873609171.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/11arpdmiv1a3k3dvq6f87lk9ja/wosilebib.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/c775cd2412127e2ed0b1447e93244fa5/63055993177.pdf
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/epq02tqf2imhg463a3kvhqlnb3/vagosurupasa.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e76d45d227---56985447384.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/3656b5329ea1f76c63263fcd4b4feb36/79057017298.pdf
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/4n2qo4k8bnpl8j544saj4umd85/viwetabunokegikume.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/27512fed3d53c47fa95ddfa263a10d46/86802853530.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c35caaafd1d---17165999426.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=learning+to+die+in+the+anthropocene
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104ce.bin
4c038a78e24c7a8ca49ba4faf9725b8e109e437e936195a0da7bb3957bfde70d
pdf-font-stream PDF embedded font (sfnt) at offset 0x104CE 10536 bytes
font_01_sfnt_off00011c7b.bin
1f6a29e735c1e72b6b8516b0ddaf02c890055696bc46c641665ac79ecd9de073
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7B 17320 bytes
font_02_sfnt_off00014a0b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14A0B 16792 bytes